Doesn't mtgox have a 100btc/$1000 limit per day
On withdrawals, yes. You can sell all your BTC at once, and then withdraw $1000 every day for a long long time.
Well the fees would be huge, and I believe if you did just few such right under $1000 withdrawals in one week, your account would be frozen and you would have to validate - you know these anti terrorist/laundering laws...